001 /*
002 * Copyright 2001-2005 Stephen Colebourne
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 * http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016 package org.joda.time.tz;
017
018 import java.text.DateFormatSymbols;
019 import java.util.HashMap;
020 import java.util.Locale;
021
022 /**
023 * The default name provider acquires localized names from
024 * {@link DateFormatSymbols java.text.DateFormatSymbols}.
025 * <p>
026 * DefaultNameProvider is thread-safe and immutable.
027 *
028 * @author Brian S O'Neill
029 * @since 1.0
030 */
031 public class DefaultNameProvider implements NameProvider {
032 // locale -> (id -> (nameKey -> [shortName, name]))
033 private HashMap iByLocaleCache = createCache();
034
035 public DefaultNameProvider() {
036 }
037
038 public String getShortName(Locale locale, String id, String nameKey) {
039 String[] nameSet = getNameSet(locale, id, nameKey);
040 return nameSet == null ? null : nameSet[0];
041 }
042
043 public String getName(Locale locale, String id, String nameKey) {
044 String[] nameSet = getNameSet(locale, id, nameKey);
045 return nameSet == null ? null : nameSet[1];
046 }
047
048 private synchronized String[] getNameSet(Locale locale, String id, String nameKey) {
049 if (locale == null || id == null || nameKey == null) {
050 return null;
051 }
052
053 HashMap byIdCache = (HashMap)iByLocaleCache.get(locale);
054 if (byIdCache == null) {
055 iByLocaleCache.put(locale, byIdCache = createCache());
056 }
057
058 HashMap byNameKeyCache = (HashMap)byIdCache.get(id);
059 if (byNameKeyCache == null) {
060 byIdCache.put(id, byNameKeyCache = createCache());
061 String[][] zoneStrings = new DateFormatSymbols(locale).getZoneStrings();
062 for (int i=0; i<zoneStrings.length; i++) {
063 String[] set = zoneStrings[i];
064 if (set != null && set.length == 5 && id.equals(set[0])) {
065 byNameKeyCache.put(set[2], new String[] {set[2], set[1]});
066 // need to handle case where summer and winter have the same
067 // abbreviation, such as EST in Australia [1716305]
068 // we handle this by appending "-Summer", cf ZoneInfoCompiler
069 if (set[2].equals(set[4])) {
070 byNameKeyCache.put(set[4] + "-Summer", new String[] {set[4], set[3]});
071 } else {
072 byNameKeyCache.put(set[4], new String[] {set[4], set[3]});
073 }
074 break;
075 }
076 }
077 }
078
079 return (String[])byNameKeyCache.get(nameKey);
080 }
081
082 private HashMap createCache() {
083 return new HashMap(7);
084 }
085 }